83 lines
3.3 KiB
HTML
83 lines
3.3 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>RAND_bytes</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:nwani@atx-osx1010-2.corp.continuum.io" />
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</head>
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<body>
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<ul id="index">
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<li><a href="#NAME">NAME</a></li>
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<li><a href="#SYNOPSIS">SYNOPSIS</a></li>
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<li><a href="#DESCRIPTION">DESCRIPTION</a></li>
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<li><a href="#NOTES">NOTES</a></li>
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<li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
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<li><a href="#HISTORY">HISTORY</a></li>
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<li><a href="#SEE-ALSO">SEE ALSO</a></li>
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<li><a href="#COPYRIGHT">COPYRIGHT</a></li>
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</ul>
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<h1 id="NAME">NAME</h1>
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<p>RAND_bytes, RAND_priv_bytes, RAND_pseudo_bytes - generate random data</p>
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<h1 id="SYNOPSIS">SYNOPSIS</h1>
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<pre><code> #include <openssl/rand.h>
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int RAND_bytes(unsigned char *buf, int num);
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int RAND_priv_bytes(unsigned char *buf, int num);</code></pre>
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<p>Deprecated:</p>
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<pre><code> #if OPENSSL_API_COMPAT < 0x10100000L
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int RAND_pseudo_bytes(unsigned char *buf, int num);
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#endif</code></pre>
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<h1 id="DESCRIPTION">DESCRIPTION</h1>
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<p>RAND_bytes() puts <b>num</b> cryptographically strong pseudo-random bytes into <b>buf</b>.</p>
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<p>RAND_priv_bytes() has the same semantics as RAND_bytes(). It is intended to be used for generating values that should remain private. If using the default RAND_METHOD, this function uses a separate "private" PRNG instance so that a compromise of the "public" PRNG instance will not affect the secrecy of these private values, as described in <a href="../man7/RAND.html">RAND(7)</a> and <a href="../man7/RAND_DRBG.html">RAND_DRBG(7)</a>.</p>
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<h1 id="NOTES">NOTES</h1>
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<p>Always check the error return value of RAND_bytes() and RAND_priv_bytes() and do not take randomness for granted: an error occurs if the CSPRNG has not been seeded with enough randomness to ensure an unpredictable byte sequence.</p>
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<h1 id="RETURN-VALUES">RETURN VALUES</h1>
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<p>RAND_bytes() and RAND_priv_bytes() return 1 on success, -1 if not supported by the current RAND method, or 0 on other failure. The error code can be obtained by <a href="../man3/ERR_get_error.html">ERR_get_error(3)</a>.</p>
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<h1 id="HISTORY">HISTORY</h1>
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<ul>
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<li><p>RAND_pseudo_bytes() was deprecated in OpenSSL 1.1.0; use RAND_bytes() instead.</p>
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</li>
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<li><p>RAND_priv_bytes() was added in OpenSSL 1.1.1.</p>
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</li>
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</ul>
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<h1 id="SEE-ALSO">SEE ALSO</h1>
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<p><a href="../man3/RAND_add.html">RAND_add(3)</a>, <a href="../man3/RAND_bytes.html">RAND_bytes(3)</a>, <a href="../man3/RAND_priv_bytes.html">RAND_priv_bytes(3)</a>, <a href="../man3/ERR_get_error.html">ERR_get_error(3)</a>, <a href="../man7/RAND.html">RAND(7)</a>, <a href="../man7/RAND_DRBG.html">RAND_DRBG(7)</a></p>
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<h1 id="COPYRIGHT">COPYRIGHT</h1>
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<p>Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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